John,
Glad to hear you are up and running. I must be way over propped with my 16 x 17.
cruise @ 23kts @ 3400 rpm. Have any pictures of the dual muffler setup? I would pull a few spark plugs and inspect closely for any signs of reversion if you have not already done so just to be sure. The exhaust on these inboard run close the static waterline.
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